Double-acting hydraulic pump



July 1, 1935. F. D. COLETTA 2,008,243

DOUBLE ACTING HYDRAULIC PUMP Filed June 18, 1934 2 Sheets-Sheet 1 41 e 15 26' M Q a Z19 Fig.3. 37 .22

\Q? I vv Z2 M *1 47 27 Q i I Snnentor July 16, 1935. F. D. coLETTA 2,008,243

DOUBLE ACTING HYDRAULIC PUMP Filed June 18, 1954 2 Sheets-Sheet 2 Snnentor attorneys,

Patented July 16, 1935 UNITED STATES PATENT OFFICE Application June 18, 1934, Serial No."zs1,147 In Brazil July 29, 1933 a Ola-inns. (or 103-146) The present invention relates to pumps of the hydraulic type, and has for an object to provide a pump of large capacity relative to the size of the pump, and to provide a pump of but few 5 movable and separate parts.

The present invention provides a pump having two semi-spherical parts which, when united, form a hermetically sealedspherical chamber or casing in which is mounted'on a single axis but one piston so disposed and sealed. in the chamher as to rock on its axis and efiect a double pumping action,

The present invention is an improvement on semirotative pumps, having metallic shovel blades of the type known as the vane or wing pump as these bladepumps are widely used on account of their low cost, but lack capacity and their eifective operation is of but short duration.

Many prior attempts have been made to improve -this type of pump but the suggested changes have not warrantedtheir adoption in that they failed their objects or unwarrantedly increased the sizeand cost of the pump.

The present pump overcomes all of the prior disadvantages with a construction which is of utmost simplicity and extremely accuratein operation, which is strong and durable and which may be operated with a minimum of effort. 7

With the foregoing, and other objects in view,

the invention will be more fully described hereinafter, andwill be more particularly pointed out in the claims appended hereto. V

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views,

Figure 1 is-a front elevation of the pump of this invention.

Figure 2 is a section-taken through the same on the line 2 -2 of Figure l. a

Figure 3 is a section taken axially atright angles to and on the line 3-3 of Figure 2.

Figure 4 is a detail top plan view of the single piston and valve unit.

Figure 5 is a detail top plan view of the sector with its valves. Figure 6 is a bottom plan view of the same.

Figure 7 is a detail perspective view of the partition packing for the piston.

Figure 8 is a detail sectional view through the piston body.

Figure 9 is a detail sectional view through the piston nut and packing, and

Figure 10 is a detail enlarged View, partly in section, showing a slightly modified form of handle and mounting therefor on the rocker shaft.

Referring to the drawings, I5 and I6 designate the opposed sectionsor parts of the pump casing. These parts are of semi-spherical construction and the parts I 5' may be provided at the bottom and top respectively with inlet and outlet connections l1 and 18 for attachment to pipes or the like through which liquid is to be pumped. The casing parts I5 and I6 are flanged and held together by bolts! 9, asshown in Figure 1, and any suitable packing mayfbe interposed to effectively seal the joint between the parts. The parts may be of any exterior configuration but interiorly theyj provide a substantially true spherical chamberlf centrallydisposed in the parts; l5 and I6 are journal-bearings 20 and 2! which are coaxial with each other an'd with the transverse axis of the spherical' chamber. A rocker shaft 22 has bearingat one endin the bearing 20 which is plosedflat its outer end and at its other end passes through-the bearing 2 I and beyond the same for receiving a handle *23. A gland or packing 24 sal's'the outer'end of the shaft 22 in the bearing 2 I. "A singlepi'ston of the rocking type is mounted on the shaft 22 within the spherical chamber and has abody portion 25, as shown in detail in Figure 8, of annular form with exterior threads and an outstanding annular shoulder 26 at the base of the threads. Extending diametrically across the lower closed end of the body portion is a tubular rib 21 shaped at opposite ends to conform to the spherical contour of the inner wall'of the casing chamber and which has afiat upper wall 28 for contact through the 'rib 21 and is held from shifting by shoulders 3Q suitablyformed on the shaft, one of which may be'struck upafter the rib is in place.

" The piston" body 25 has a valve port 3| at each side of the rib 21 and a flap valve 32 is provided for each port 3|. The valves 32 comprise flat plates normally lying on the upper face of the piston body 25 and have pairs of arms 33 which converge upwardly and overlap at their upper ends and are connected together and pivotally supported on a pivot rod 34 which also passes through a centrally disposed post 35 in the piston body 25. 'The annular wall of the piston body has an opening 36 in one side thereof in line with theop'ening' in the post 35 to admit easy assemblingof the valves 32 in the piston body. A ring has an upwardlytapering and rounded periphcasing chamber to seal the piston thereagainst.

As the rib 23 extends across the bottom of the piston 25 the latter is supported above the central axis. of the spherical casing and therefore the piston hasnot on y a pivotal movement but also a bodily mo-vementwhen reciprocated or swung back and forth. A substantial fluid chamber is thus provided beneath the piston and ample room is provided for a valve and partition structure for the casing.

- Within the bottom of the pump casing is dis posed a sector-shaped valve block 39 which is hollow andphas its base portion lowermost and communicating with the intake connection 11 of the valve casing. The bottom wall of the block 39 is apertured forthis purpose, as shown particularly in Figures 2 and 3.

It will be noted from Figure 2 that the sector valve block is elongated in the direction of the axisof the shaft 22 and that it is rounded or curved at opposite ends to fit snugly against the interior wall of the casing. Screws 40 pass through the lower walls of the casing and engage the valve block tohold it in place. The opposite upwardly converging sides of-the valveblock 39 are provided with valve ports 4| and 42 which are normally covered by checkor flap valves 43 which normally rest against the inclined sides of the valve block over theports 4i and 42 and which have arms 44 pivotally connected at 45 to lugs 46 which extend outwardly in opposite directions from the apex portion of the valve block. At the apex, the valve block is provided with a longitudinal channel 41 which opens upwardly through the block and faces the lower side of the rib 26 carried upon the shaft 22. A channel packing 48 in the form of a flexible sheet or strip overturned upon itself is secured at its overturned portion in the channel a l and has its free edge portions flaring upwardly and bearing against the lower rounded side of the tubular rib. 2'! so that the packing 43 and the valve block 39 provide a partition which is disposed intermediate the lower end of the casing and which is sealed against the lower axial portion of the piston.

In operation, the handle 23, or other suitable operating device connected to the shaft 22 is reciprocated back and forth to rock the shaft 22 and the piston '25 carried thereby. As one side of the piston 25 is swung upwardly, as

shown in Figure 3, the suction created beneath said side of the piston raises the adjacent check valve 43 and draws liquid upwardly through the intake ll of the casing and into and through the valve block 39, the fluid passing outwardly through the port 4| and into the lower or intake chamber of the casing. p During this swinging movement of the piston 25 the opposite side thereof is swung-downwardly whereupon the liquid entrapped in the opposite intake chamber of the pump holds the flap valve 43 to its seat to close the port 42 and .alsoflows upwardly through the adjacent opening 3! in the piston body and raises the .a rocker flap valve 42 so that the liquid passes intothe upper or outlet chamber of the pump. As soon as the piston 25 is rocked in the opposite direction the liquid in the outlet chamber of thepump is forced upwardly through the outlet connection IB as the flap valve 32 at the lower side of the piston is closed by the weight of the liquid and the flap valve 43 of the valve casing is also closed by the weight of the liquid, the piston at its lower side enlarging the adjacent intake chamber and opening the adjacent flap valve 43 for drawing in an additional quantity of liquid through the valve port 42 of the casing.

As the casingis' of spherical form the pump is of relatively large capacity as the entire cross sectional area of the chamber of the pump is utilized as the intake and outlet chambers. The single piston also occupies a'minimum of space and the valve arrangement of both the piston and the casing is such that the valves are posi-- tive in operation and the pivots and mountings for the valves are of simple constructionand,

may be readily had to the interior of the pump for renewing the washer 38 when worn.

-It is obvious that various changes and modifications may be made in the details of construction and design of the above specifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claims. 7

A slight modification is shown in Figure 10 wherein the shaft 22 has a handle 49 with a hub 50 fitting over theend of the shaft and locked thereto by a key A set screw- 52 may be threaded through the hub 50 to bind against the shaft 22 and hold the handle firmly in place. 7 7

What is claimed is: V

1. A double acting hydraulic pump, comprising a casing composed of a pair of mating sections each having a semi-spherical chamber portion therein, a shaft journaled in said casing sections co-axial to the chamber, a piston fitting in the chamber and connected at its intermediate lower portion to the shaft, means for rocking the shaft and piston, a post rising from the central portion of the piston, a pivot rod carried by the post, a pair of flap valves pivotally mounted on the rod andseated against the top of the piston at opposite sides of the post and the shaft, said piston having valve ports therethrough beneath the flap valves, a hollow valve block seated in the bottom of the chamber and having valve ports in opposite sides, flap valves. pivotally mounted on the valve block for covering said ports, and a sealing washer carried on the upper end of the valve block for engaging the piston and sealing the block thereagainst to divide the lower portion of the chamber into opposed sections, said casing having an inlet connection opening into the valve block and having an outlet connection leading from the chamber above the piston.

2. A double acting hydraulic pump comprising a casing having a spherical chamber therein with an inlet leading to the bottom of the chamber and an outlet leading from the top thereof, shaft journaled in the casing coaxial with the chamber, a piston fitting in the chamber and having a rib across its lower end keyed to the shaft to rock the piston with the shaft, a

clamping nut carried by the piston, a sealing washer carried by the piston beneath the nut and having an outer portion enclosing the nut, the exterior surface of the nut conforming substantially to that of the inner wall of the spherical casing for supporting the washer in sealing engagement therewith, said piston having valve ports therethrough at opposite sides of the rib, a pair of flap valves for said ports, a common pivot for the flap valves carried by the piston, a valve block mounted in the lower end of the chamber and communicating with the intake connection of the casing and having opposed valve ports opening into the chamberybeneath the opposite sides of the piston, a sealing washer carried by the valve block bearing against the rib of the piston to sealthe valve block thereagainst, and flap valves pivotally mounted on the valve block for closing said ports therein.

3. A double acting hydraulic pump comprising a casing having a spherical chamber therein, a shaft mounted axially in the chamber and adapted to be reciprocated, a piston sealed in the chamber and having a transverse rib across its bottom engaging the shaft for supporting the piston above the shaft and for rocking movement with the shaft, and having valve ports at opposite sides of the rib, said piston also having an intermediate upstanding post, valves mounted on the post of the piston at opposite sides of the rib to control the valve ports, a valve block, mounted in the bottom of the chamber and sealed against said rib, and valves carried by the valve block opening into the chamber beneath the piston at opposite sides of the partition, said casing having an inlet connection opening into the valve block and having an outlet connection leading from the casing chamber above the piston,

FIORINDO D. COLETTA. 

